Armchair



FIG. 1 is a front-right perspective view of an armchair showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a right side elevational view thereof, the left side being a mirror image;

FIG. 4 is rear elevational view thereof; and,

FIG. 5 is top plan view thereof, shown with the rear side of the armchair laying on a hard surface. 

The ornamental design for an armchair, as shown and described. 